Magazine steam-boiler



(No Model.) l

W. B. DUNNING. M

MAGAZINE STEAM BOILBR.

No. 349,699. Patented Sept; Z8, 1886.

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UNITED y STATES'l PATENT OFFICE.

XVILLIAM B. DUNNING, OF GENEVA, \TE\V YORK.

-MAGAZINE STEAM-Bomen.

E'SPECIFICATION forming part of Letters Patent No. 349,699,6lated September 28, 1886.

Ajiplication filed January 26, 1886. Serial No. 1-5),8-l9. (No model.)

To all whom t may concern.-

Be it known that LWILLIAM B. DUNNING, a citizen of the United States, residing in Geneva, in the county of Ontario and State of New York, have invented certain newaud useful Improvements in Magazine Steam-Boilers, of which the following is a specification.

My invention relates to steam-boilers; and the invention consists in certain improvements of the magazine-boiler for which a patent was granted to me April 12, 1870, No. 101,718, which said improvement 'is hereinafter more fully described. l

The drawing is atran'sverse vertical section of a boiler set ready for use with my improvement applied thereto. The boiler B, as shown, is made annular in form, with a fire-chamber, (l, in its interior at or near the bottom,- and which extends upward around the magazine M, which is suspended centrally from the top. At a point about two-thirds the height of the boiler there is an annular enlargement, E, of the fire chamber C, from which a series of filles, a, extend downward through the annular water-space ofthe boiler B, through which lues the productsof combustion are compelled to pass to the bottom, thence passing upward around the exterior of the boiler through an annular flue, h, and thence into the chimney L through/an opening or pipe, O, as indicated by the arrows. The external line, 71, is usually 'formed by inclosing the boiler in brick-work, as shown, though a metallicjacket is sometimes substituted for the brick -work, more especiall y with the smaller-sized boilers, and when they are designed to be set in rooms where they are constantly in sight, simply for convenience or appearance.

Thus far I have described the boiler as I have heretofore made it, and when thus made it will be seen that there is no escape for the smoke or products of combustion, except down through the lines a, as above described. When starting a fire at the beginning ot' the season, or at any time after the re has been extinguished for some considerable time, the chimney, and all the nues both inside and outside of the boiler, will ofcourse be illed with cold air, which,being heavier than the dame and smoke created by the newly-kindled lire within the boiler,cannot be readily or immediately forced out through the chimney, and as the iiame, smoke, and gases within cannot enter and pass off through the chimney, and are con-` stantly being increased in volume, the result 5 5 is, that they are forced y out into the room, sometimes with considerable force, owing to the vpressure of the gases within the fire-chamber. To remedy this difliculty `I provide the boiler with a flue or tube, J, as shown inthe 6c drawing, thistlue J extending from the enlarged'tire-chamber E directly upward through the steam-dome D and out through the top, the joints being rendered steam-tight where it passes through the dome or chamber D,both above and beloi The upperend of this flu'e J- is then connected by an elbow and pipe with the smoke-Hue or chimney L, as shown in the drawing. I arrange a valve or damper, e, in the pipe, preferably as near the boiler as is 7o convenient, by which the draft through the fine J can' be stopped, when desired.

When starting a fire, the damper eis opened, thus allowing the hot gases and smoke to pass directly upward through the ue J, and from 7 5 thence into the chimney L, from which they soon force the cold air and establish a strong upward current therein. As soon as the boiler becomes warmed and a good current is estab- `lished in the chimney, the damper e is closed, 8c

when the products of combustion immediately take 'the route down through the lower fines, a, and thenceup around the boiler and through the passage o into the chimney L, this being their normal route when the boiler is in operation. By this improvement the difficulty previously mentioned is entirely overcome, and a re can be started at any time without the annoyance of gas or smoke entering the room from theiirechamber. The same result may be ac- 9o complished by making an opening, r, through the side of the boiler, and providing it with a damper, e,as shown at the ri ght-hand side ofthe gure. Ifthisplan beused,theopeningrshould be made at the back side ofthe boiler, or as near the smoke-flue O as may be convenient, and above the brick diaphragmm, as shown,so that the smoke and gases may have the shortest and most direct route possible to the chimney. The damper e in such case may be hinged, so as to roo be turned up when open, as shown in the drawing, in which ease it will be held shut by gravity; or vit may be arranged to slide, or be pivoted so as to turn the same as the damper e in the pipe J, the form or arrangement of the damper being merely a matter of choice or convenience for the manufacturer. It will of course be understood that, whichever form be used, arod will opening O having to be located at one or the other side, or possibly at the front si.de,of boiler, and in such cases, by using the upright line or tube J, the smokepipe connected thereto can be turned or carried in any desired direction to suit the circumstances of the case. rIhis direct draft is also useful to assist in starting up the fire whenever it has become low and it is desired to get up steam quickly. So, too, it may be used to a greater or less extentin connection with the indirectdraft by properly adjusting the damper in those cases where the draft of the chimney is not as good or strong as desired, and which is not unfrequently the case in private dwellings built without reference to the use 0f a steam-heater, and into which it is now a common practice to introducethis style of boiler.

In an application iiled by me January 7,1886, Serial No. 187,702, Ihave shown and described a boiler which has an annular iiue instead of same as to this, and I propose to so apply and i use it. In that case, if the vertical line J be used, it would simply start at the top or covering plate, and would not pass through the steam-chamber, while if thelateral 'flue a were used it would pass through the outer water y chamber or shell at any desired point at or near its upper end.

I am aware that both stoves and boilershave been made With a direct and an indirect draft, and also that steain-boilers have been constructed with direct and indirect drafts in various ways, and that boilers have been patented showing a smoke bonnet or chamber over the steam-space or top of the boiler with a direct smoke-flue leading` therefrom, and I do not claim any of these; but

In combination with the boiler B, the central magazine, M, the surrounding lire-chamber (il, having the annular enlargement E, with the descending flues (t, for the indirect draft, and

the upright fille J, or its equivalent outlety from the enlargement E, for a direct draft,and a damper for closing the same, substantially as shown and described.

XVM. B. DUNNING.

' XVitnesses:

S. SoU'rHWoRTin CHAs. H. Rusa. 

